Upper and lower receiver for a firearm



FIG. 1 is an upper, left, rear perspective view of the upper and lower receiver for a firearm, showing my new design;

FIG. 2 is an upper, right, rear perspective view thereof;

FIG. 3 is an upper, right, front perspective view thereof;

FIG. 4 is an upper, left, front perspective view thereof;

FIG. 5 is a lower, left, front perspective view thereof;

FIG. 6 is a lower, right, front perspective view thereof;

FIG. 7 is a lower, right, rear perspective view thereof;

FIG. 8 is a lower, left, rear perspective view thereof;

FIG. 9 is a right side view thereof;

FIG. 10 is a left side view thereof;

FIG. 11 is a top plan view thereof;

FIG. 12 is a bottom plan view thereof;

FIG. 13 is a front view thereof; and,

FIG. 14 is a rear view thereof. 

CLAIM The ornamental design for an upper and lower receiver for a firearm, as shown and described. 